Door check



July 18, 1950 J. J. JONES DOOR CHECK Filed Feb, 13, 1947 James J. Jo/)e514 INVENTOR.

16' AIToRNE Patented July 18, 950

1 Claim.

The invention relates to door checks, andvhas for its object to providea device of this kind of the cylinder and piston type, so mounted andconstructed, that a wide range of opening of the door is accomplishedwith `the minimum amount of movement of the piston within the cylinder.I

A further object is to provide a door check comprising a hingedlymounted cylinder having a piston and piston rod therein, and carried bythe hinged door, and spring means cooperating with the piston rodwhereby, the piston and piston rod will be held against axial movementas the door is partially opened and moved with the cylinder withoutaxial movement upon excessive movement of the door to open position.

With the above and other objects in view the invention resides in thecombination and arrangement of parts as hereinafter set forth, shown inthe drawing, described and claimed, it being understood that changes inthe precise embodiment of the invention may be made within the scope ofwhat is claimed without departing from the spirit of the invention.

In the drawing:

Figure 1 is a horizontal sectional view through a. hinged door and partof the door frame, showing the door check applied thereto.

Figure 2 is a detail perspective view of the torsion spring mounting andthe piston rod in engagement with the door frame.

Referring to the drawing, the numeral I designates the door which swingsin the direction of the arrow a towards an open position. Door I ishingedly connected to the side 2 of the door frame by a conventionalspring hinge 3.

.Secured to the inner side of the door I is a U-shaped bracket 4,between the arms of which the door check cylinder is pivoted at 6.During the opening and closing of the door, the cylinder 5, hingedlymoves in a horizontal plane.

Reciprocally mounted within the cylinder 5 is a piston 1 carried by apiston rod 8. The piston rod 8 is slidably mounted in the end plug 9 ofthe cylinder, and extends outwardly beyond said plug into engagementwith the door frame 2, at I0. The engagement, at I0, is normallymaintained on the initial opening of the door by means of the arm II ofthe U-shaped member l2, the downwardly extending arm I3 of which isrockably mounted in the ears of a U-shaped bracket I4 carried by thedoor frame, clearly shown in Figure 2.

Surrounding the arm I3 is a torsion spring I5, the lower end of which isanchored at I6 to S PATENT Doon CHECK u JlJ-ns,Tlllsaioklf* ApplicationFebruary 13, 1947, Serial No. 728,255

the bracket I4, and the upper end of the torsion spring terminates in aninwardly extending arm I1, which arm engages the arm II and urges theouter end of the piston rod 8 towards the door frame. -Upon initialmovement of the door I from. its closed position, shown in Figure 1,full line, to the dotted line position, shown in Figure 1, the doormoves substantially ninety degrees, and during this movement the torsionspring I5 maintains the piston rod engagement, at Ill, with the doorframe. During this movement the piston has moved to a position where itwill engage the inner end of the plug 9, as at I8; then as the door isfurther opened towards the one hundred and eighty degree position, shownat c, the piston rod will pull outwardly on the U-shaped member I2,against the action of the torsion spring. Therefore it will be seenthere has been a minimum amount of movement of the piston 1 within thecylinder 5, and the torsion spring I5 will act as a door closer,assisting the spring hinge 3 on the closing operation.

The free end of the cylinder 5 is provided with an intake valve I9, andan exhaust valve 20 of conventional construction. The intake valve I9 isof the disc type and normally cooperates with an intake port I9a. ValveI9 is provided with a shaft or stem |91)A with which a helical springI9c cooperates for normally maintaining the valve I9 in closed position.The exhaust regulation is controlled by the screw 20 having a valve end20a, which cooperates with an exhaust port 20h.

As the door moves from the extreme open position to closed position, thepiston 1 will remain in engagement with the end I8 of the plug 9 untilthe parts reach the ninety degree position, and following this, theouter end of the piston rod will be in engagement at I0 with the doorframe, andv as the piston moves into the cylinder 5, there will be achecking of the door. It will be noted, with this arrangement, that theamount of wear on the piston will be reduced to a minimum, therebymaterially increasing the life of the piston and the usual piston cups.

From the above it will be seen that a door check is provided which issimple in construction, and constructed in a, manner whereby the doorcan open one hundred and eighty degrees with a minimum amount of travelof the piston within the cylinder.

The invention having been set forth what is claimed as new and usefulis:

A door check connection between a reciprocating piston rod carried by adoor check cylinder hingedly mounted on a door for horizontaloscillation on its hinged point, the outer end of said piston rod beinglimited in its outward movement by engagement with one side of the doorframe, said connection comprising a bracket carried by the door frame, alink connection between said bracket and the frame engaging end of thepiston rod, said link connection comprising an inverted L-shaped member,onearm `of the L.shaped memberlbeing rotatably mounted in theido'orframe bracket, the other arm of said L-shaped member being hingedlyconnected to the outer l.;

end of the piston rod, and spring means carried by the bracket andcooperating with the arm of the L-shaped member connected tothe pistonrod for normally forcing the piston rod and last named arm towards thedoor frame side.

JAMES J. JONES.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNQI'IED STATES PATENTS 10 lNumb-efr- QJNamej Date 759,621 n Lackey V10, 1904 :1].36300 Mothmillel DEC. 23, 1920 v FOREIGN PATENTS y NumberCountry Date 15-'' 298,890 Great Britain Nov. 1, 192s

